Running in New and Worn Shoes

NewsBot · Sep 30, 2008

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Running in New and Worn Shoes - A Comparison of Three Types of Cushioning Footwear
Pui Wah Kong, Norma G. Candelaria and Darla Smith
Br J Sports Med. Published Online First: 18 September 2008

Objectives: To investigate the effect of shoe degradation on running biomechanics by comparing the kinetics and kinematics of running in new and worn shoes. Three types of footwear using different cushioning technologies were compared.

Design: Longitudinal study.

Setting: Pre- and post-tests on overground running at 4.5 m·s-1 on a 20-m laboratory runway; performance measured using a force platform and a motion capture system.

Participants: 24 runners (14 males, 10 females).

Interventions: 200 miles of road running in the same pair of shoes. Within-group factor: shoe condition (new/worn); between-group factor: footwear types (spring/air/gel).

Main Outcome Measurements: Stance time was calculated from force data. External loads were measured by maximum vertical force and loading rate. Kinematic changes were indicated by sagittal plane angles of the torso, hip, knee and ankle at critical events during the stance phase.

Results: Stance time increased (P = 0.035) in worn shoes. The torso displayed less maximum forward lean (P < 0.001) and less forward lean at toe-off (P < 0.001) while the ankle displayed reduced maximum dorsi-flexion (P = 0.013) and increased plantar-flexion at toe-off (P < 0.001) in worn shoes. No changes in the hip and knee angles. No between-group difference among the three footwear groups or condition by type interaction was found in any measured variables.

Conclusions: As shoe cushioning capability decreases, runners modify their patterns to maintain constant external loads. The adaptation strategies to shoe degradation were unaffected by different cushioning technologies, suggesting runners should choose shoes for reasons other than cushioning technology.
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Admin2 · Sep 30, 2008

Related threads:
Other running shoes threads
Other threads on impact forces

Craig Payne · Oct 1, 2008

NewsBot said: ↑

Stance time increased (P = 0.035) in worn shoes. The torso displayed less maximum forward lean (P < 0.001) and less forward lean at toe-off (P < 0.001) while the ankle displayed reduced maximum dorsi-flexion (P = 0.013) and increased plantar-flexion at toe-off (P < 0.001) in worn shoes
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They are changes in performance and injury related parameters.

I understand that the average running shoe should be changed at around 400-800km (obviously depending on the shoe, mechanics, surface and bodyweight); the above study measured the effects of shoe wear after only ~300 km (200 miles) ... so who knows what is going on at even greater amount when it is recommended that shoes be changed.

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